Patients in the general population with sporadic tumors of the types seen in the IBMFS (head
and neck, gastrointestinal, and anogenital cancer), with none of the usual risk factors (e.g.
smoking, drinking, HPV).

Patients in the general population with sporadic tumors of the types seen in the IBMFS (head
and neck, gastrointestinal, and anogenital cancer), with none of the usual risk factors (e.g.
smoking, drinking, HPV).